<template>
  <div class="app-container">
      <h2 style="text-align:center;">课程大纲</h2>
      <el-steps :active="2" process-status="wait" align-center style="margin-bottom:40px;">
          <el-step title="填写课程基本信息"/>
          <el-step title="创建课程大纲"/>
          <el-step title="最终发布"/>
      </el-steps>

      <el-button type="text" @click="openChapterDialog()">添加章节</el-button>

      <ul class="chapterList">
          <li v-for="chapter in chapterVideoList" :key="chapter.id">
              <p>
                  {{ chapter.title }}

                  <span class="acts">
                      <el-button type="text" @click="openVideoDialog(chapter.id)">添加小节</el-button>
                      <el-button type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                      <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                  </span>
              </p> 
              <ul class="chapterList videoList">
                  <li v-for="video in chapter.children" :key="video.id">
                      <p>
                          {{video.title}}
                          <span class="acts">
                              <el-button type="text" @click="openEditVideo(video.id)">编辑</el-button>
                              <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                          </span>
                      </p> 
                  </li> 
              </ul>
          </li>
      </ul>

      <div>
          <el-button @click="previous">上一步</el-button>
          <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </div>

      <!-- 添加和修改章节表单 -->
      <el-dialog :visible.sync="dialogChapterFormVisible" title="章节">
          <el-form :model="chapter" label-width="120px">
              <el-form-item label="章节标题">
                  <el-input v-model="chapter.title"/>
              </el-form-item>
              <el-form-item label="章节排序">
                  <el-input-number v-model="chapter.sort" :min="1" controls-position="right"/>
              </el-form-item>
          </el-form>
          <div slot="footer" class="dialog-footer">
              <el-button @click="dialogChapterFormVisible=false">取消</el-button>
              <el-button type="primary" @click="saveOrUpdateChapter">确定</el-button>
          </div>
      </el-dialog>

      <!-- 添加和修改小节表单 -->
      <el-dialog :visible.sync="dialogVideoFormVisible" title="小节">
          <el-form :model="video" label-width="120px">
              <el-form-item label="小节标题">
                  <el-input v-model="video.title" placeholder="请输入小节标题"/>
              </el-form-item>
              <el-form-item label="小节排序">
                  <el-input-number v-model="video.sort" :min="1" controls-position="right"/>
              </el-form-item>
              <el-form-item label="是否免费">
                  <el-radio-group v-model="video.free">
                      <el-radio :label="true">免费</el-radio>
                      <el-radio :label="false">默认</el-radio>
                  </el-radio-group>
              </el-form-item>
              <el-form-item label="上传视频">
                  <el-upload :on-success="handleVodUploadSuccess" :on-remove="handleVodRemove" 
                    :before-remove="beforeVodRemove" :on-exceed="handleUploadExceed"
                    :file-list="fileList" :action="BASE_API + '/eduVod/video/uploadAlyVideo'"
                    :limit="1" class="upload-demo">
                    <el-button size="small" type="primary">上传视频</el-button>
                    <el-tooltip placement="right-end">
                        <div slot="content">最大支持 1G，<br>
                            支持 3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                            GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                            MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                            SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                        <i class="el-icon-question"/>
                    </el-tooltip>
                  </el-upload>
              </el-form-item>
          </el-form>
          <div slot="footer" class="dialog-footer">
              <el-button @click="dialogChapterFormVisible=false">取消</el-button>
              <el-button type="primary" @click="saveOrUpdateVideo">确定</el-button>
          </div>
      </el-dialog>
  </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
export default {
    data(){
        return {
            saveBtnDisabled : false,
            chapterVideoList : [],
            courseId : '',
            chapter : {
                title : '',
                sort : 1,
                courseId : ''
            },
            video : {
                title : '',
                sort : 1,
                free: false,
                chapterId : '',
                videoSourceId : '',
                videoOriginalName : ''   // 视频名称
            },
            dialogChapterFormVisible : false,    // 章节弹窗
            dialogVideoFormVisible : false,      // 小节弹窗
            fileList : [],  // 上传文件列表
            BASE_API : process.env.BASE_API
        }
    },
    created(){
        // 获取路由 id 值
        if(this.$route.params && this.$route.params.id){
            this.courseId = this.$route.params.id
            this.getChapterVideo()
        }
        // 根据课程 id 查询章节和小节

    },
    methods: {
        handleUploadExceed(files, fileList){
            // 视频上传多于一个视频
            this.$message.warning('想要重新上传视频，请先删除已上传的视频')
        },
        beforeVodRemove(file, fileList){
            // 点击删除时调用的方法
            return this.$confirm(`确定移除 ${file.name} ?`,'提示',{
                confirmButtonText : '确定',
                cancelButtonText : '取消',
                type : 'warning'
            })
        },
        handleVodRemove(){
            // 点击确定删除调用的方法
            // 调用接口删除
            video.deleteAlyVod(this.video.videoSourceId)
                .then(response => {
                    this.$message({
                        type : 'success',
                        message : '删除视频成功!'
                    });
                    // 把文件列表情况
                    this.fileList = []
                    this.video.videoSourceId = ''
                    this.video.videoOriginalName = ''
                })
        },
        // 上传视频成功调用函数
        handleVodUploadSuccess(response, file, fileList){
            // 上传视频 id 赋值
            this.video.videoSourceId = response.data.videoId
            // 上传视频名称赋值
            this.video.videoOriginalName = file.name
        },

        // =================== 小节操作 ====================
        // 删除小节
        removeVideo(videoId){
            this.$confirm('此操作将删除小节，是否继续？','提示', {
                confirmButtonText : '确定',
                cancelButtonText : '取消',
                type : 'warning'
            }).then(res => {   
                video.deleteVideo(videoId)
                    .then(response => {
                        this.$message({
                            type : 'success',
                            message : '删除小节成功!'
                        })
                        this.getChapterVideo()
                    })
            })    
        },

        // 修改小节弹框
        openEditVideo(videoId){
            video.getVideoById(videoId)
                .then(response => {
                    this.video = response.data.video
                })
            this.dialogVideoFormVisible = true

        },
        // 添加小节弹框
        openVideoDialog(chapterId){
            // 清空小节信息
            this.video = {
                title : '',
                sort : 1,
                free: false,
                chapterId : chapterId,
                videoSourceId : '',
                videoOriginalName : ''   // 视频名称
            }
            this.fileList = []
            this.dialogVideoFormVisible = true
        },

        // 添加或修改小节
        saveOrUpdateVideo(){
            if(this.video.id){
                this.updateVideo()
            }else{
                this.addVideo()
            }
        },
        // 添加小节
        addVideo(){
            // 设置课程 id
            this.video.courseId = this.courseId
            video.addVideo(this.video)
                .then(response => {
                    this.dialogVideoFormVisible = false
                    this.$message({
                        type : 'success',
                        message : '添加小节成功!'
                    });
                    this.getChapterVideo()
                })
        },
        // 修改小节
        updateVideo(){
            video.updateVideo(this.video)
                .then(response => {
                    this.$message({
                        type : 'success',
                        message : '修改小节成功!'
                    });
                    this.dialogVideoFormVisible = false
                    this.getChapterVideo()
                })
        },

        // =================== 章节操作 ====================
        // 删除章节
        removeChapter(chapterId){
            this.$confirm('此操作将删除章节，是否继续？', '提示', {
                confirmButtonText : '确定',
                cancelButtonText : '取消',
                type : 'warning'
            }).then(() => {
                // 点击确定，执行 then 方法
                // 调用删除的方法
                chapter.deleteChapter(chapterId)
                    .then(response => {
                        this.$message({
                            type : 'success',
                            message : '删除成功!'
                        });
                        this.getChapterVideo()
                    })
            })
        },
        // 修改的弹窗
        openEditChapter(chapterId){
            chapter.getChapterInfo(chapterId)
                .then(response => {
                    // 获取数据
                    this.chapter = response.data.chapter
                    // 弹窗
                    this.dialogChapterFormVisible = true
                })
        },
        // 添加的弹窗
        openChapterDialog(){
            this.dialogChapterFormVisible = true;
            // 清空表单数据
            this.chapter.title = ''
            this.chapter.sort = 1
        },
        // 添加或修改章节
        saveOrUpdateChapter(){
            if(this.chapter.id){
                this.updateChapter()
            }else{
                this.addChapter()
            }
        },
        // 修改章节
        updateChapter(){
            chapter.updateChapter(this.chapter)
                .then(response => {
                    this.dialogChapterFormVisible = false
                    this.$message({
                        type:'success',
                        message : '修改章节成功！'
                    });
                    // 刷新页面
                    this.getChapterVideo()
                })
        },
        // 添加章节
        addChapter(){
            // 设置课程 id 到 chapter
            this.chapter.courseId = this.courseId
            chapter.addChapter(this.chapter)
                .then(response => {
                    // 关闭弹框
                    this.dialogChapterFormVisible = false
                    // 提示
                    this.$message({
                        type : 'success',
                        message : '添加章节成功!'
                    })
                    // 刷新页面
                    this.getChapterVideo()
                })
        },

        // 根据课程 id 查询章节和小节
        getChapterVideo(){
            chapter.getAllChapterVideo(this.courseId)
                .then(response => {
                    this.chapterVideoList = response.data.items
                })
        },

        previous(){
            // 跳到上一步
            this.$router.push({ path: "/course/info/" + this.courseId})
        },
        next(){
            // 跳转到第二步
            this.$router.push({ path: '/course/publish/' + this.courseId})
        }
    }
}
</script>

<style scoped>
.chapterList{
    position:relative;
    padding:0;
    margin: 0;
    list-style: none;
}
.chapterList li{
    position: relative;
}
.chapterList p{
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
}
.chapterList .acts{
    float: right;
    font-size: 14px;
}
.videoList {
    padding-left: 50px;
}
.videoList p{
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #ddd;
}
</style>